1. Life’s Structure and Classification
Section 1: Living Things

2. A. Organism – any living thing

3. 1. All living things are made of cells, the smallest unit of an organism that carries on the functions of life
Plant cell
Animal cell

4. 2. All living things grow and develop
Growth of a many- celled organism, such as a human, is mostly due to an increase in the number of cells
skin cells

5. b. In a one-celled organism, growth is due to an increase in the size of the cell
Amoeba
Paramecium

6. c. All of the changes that take place during the life of an organism are called development
Tadpole
Polliwog

7. Frog

8. 3. All living things interact with their surroundings and respond to stimuli.
Often, a response results in movement
We also call this sensing and responding

9. 4. All living things maintain homeostasis, the regulation of an organism’s internal life maintaining condition despite changes in its environment

10. 5. All living things use energy
5. All living things use energy. The energy used by most organisms comes either directly…

11. …or indirectly from the Sun

12. 6. Living things reproduce to make more of their own kind
6. Living things reproduce to make more of their own kind. Otherwise, they would die out.

13. B. Living things need a place to live, food, and water